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Tube Substitutions for:
4631
TRIODE (Detail uncertain)
Type
Substitutes
Base Diagram
4631
R87, CV1311, CV1664,
4020A
Web References
4631 (Philips) @ Franks Electron Tubes?
4631 (RCA (HB3)) @ Franks Electron Tubes?
4631 @ Radiomuseum
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